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Sat, 17 Oct 2020 21:36:42 +0000 From: Vladimir Oltean To: netdev@vger.kernel.org Cc: andrew@lunn.ch, f.fainelli@gmail.com, vivien.didelot@gmail.com, kuba@kernel.org, Christian Eggers , Kurt Kanzenbach , Hauke Mehrtens Subject: [RFC PATCH 12/13] net: dsa: tag_gswip: let DSA core deal with TX reallocation Date: Sun, 18 Oct 2020 00:36:10 +0300 Message-Id: <20201017213611.2557565-13-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201017213611.2557565-1-vladimir.oltean@nxp.com> References: <20201017213611.2557565-1-vladimir.oltean@nxp.com> X-Originating-IP: [188.26.174.215] X-ClientProxiedBy: VI1P195CA0091.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:59::44) To VI1PR04MB5696.eurprd04.prod.outlook.com (2603:10a6:803:e7::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (188.26.174.215) by VI1P195CA0091.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:59::44) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: LI44AXV/kfOR2ZHV5ijnUebkaY4bvjzDJy8n73MEeuawsl5NZwUW7SUO5nyqKqfHuOhw4/CFfvMfVjpUQHXAN68jqp30SUdPymPC98ypY8DZsAgpIZckXUwGpFFXKDysQSdGsm+B7NAiutFB5SP7ZRP08X2N77+HgedKm2So+mcOQnfU5+v6VAq1GfJ4FEyxijRJWcJovXuHcAMq1eZWQY80z4Ukjcp0KzKMOnbZMun0OVQNEDih2EhwR1tcFnNyE3RwyYd447xO2QrPw3PUAqK+ak15JNkMq3zgD4JqJ7FmVprB+N09DjU/b2U4YKoPbar+NmriILMlmO2QhAWrjYkxKzcVr8NIl0vUbR84nTlvr+rvWDigUwu3LZCilSqo7oES52HiqZYF5e70zYjTj0w/0MEtUVhma7SWZ/qNatFMQLXI8E0tK9VKkOablAo7tIg65aylE/bIN9v/Vntf2IZ6lA+1wxYtz+sxtxbq15Mo2x5Cpd/0KsVLvHPwwuq+Ze5HC12NlNjoJrP4tPbEfbpG4bnqEsth75WiNM8yx1wh93Xx2KLoMRMJDw5HtZq7u6FDhlWKKMau/sG/eQGRjSiwhvERfgYQSll4nEukpiayvhKZkWkxzFCc3KcOzTw03xrQz3y7oHbQoP9LZB1Qug== X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 247e1749-2877-40aa-8d33-08d872e4bceb X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5696.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2020 21:36:42.2277 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0/agwHQyMZ4wvQrXn7X6hcrKJBjG+C7t/3Q4u6nwtxkvnTVGWJrZgBQWUKjD13RsKfto1HpQtuVcungNPKYTyA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB5854 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Now that we have a central TX reallocation procedure that accounts for the tagger's needed headroom in a generic way, we can remove the skb_cow_head call. This one is interesting, the DSA tag is 8 bytes on RX and 4 bytes on TX. Because DSA is unaware of asymmetrical tag lengths, the overhead/needed headroom is declared as 8 bytes and therefore 4 bytes larger than it needs to be. If this becomes a problem, and the GSWIP driver can't be converted to a uniform header length, we might need to make DSA aware of separate RX/TX overhead values. Cc: Hauke Mehrtens Signed-off-by: Vladimir Oltean --- net/dsa/tag_gswip.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c index 408d4af390a0..cde93ccb21ac 100644 --- a/net/dsa/tag_gswip.c +++ b/net/dsa/tag_gswip.c @@ -63,10 +63,6 @@ static struct sk_buff *gswip_tag_xmit(struct sk_buff *skb, int err; u8 *gswip_tag; - err = skb_cow_head(skb, GSWIP_TX_HEADER_LEN); - if (err) - return NULL; - skb_push(skb, GSWIP_TX_HEADER_LEN); gswip_tag = skb->data;